1N6006B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N6006B is an 18 V, 500 mW Zener diode in DO-35 (DO-204AH) axial through-hole package manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N6006B functions as a voltage regulation and transient protection element in electronic circuits requiring 18 V reference voltage with moderate power dissipation capability.

Substitute parts must maintain electrical equivalence across voltage regulation characteristics, power handling capacity, and thermal operating range while accommodating available packaging and manufacturer options.

Key Parameters

Parameter	1N6006B (onsemi)	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	42	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	nA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	V
Operating Temperature	-65°C ~ 200°C	°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution logic for the 1N6006B is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Tolerance: ±5% (acceptable match)
Power - Max: 500 mW (minimum requirement; higher power ratings acceptable)
Package / Case: DO-204AH, DO-35, Axial (mechanical compatibility)
Mounting Type: Through Hole (required for circuit board integration)

Secondary Compatibility Factors:

Operating Temperature Range: -65°C minimum and 200°C maximum preferred; -65°C to 175°C acceptable for most applications
Impedance (Max): Values between 20–100 Ohms acceptable within design tolerance
Current - Reverse Leakage: 50–100 nA acceptable range
Voltage - Forward (Vf): 1.0–1.5 V @ 200 mA acceptable range

Substitution Categories:

Direct Substitutes (Identical Electrical Specifications): Parts matching 18 V nominal, ±5% tolerance, 500 mW power rating, and DO-35 package.

Similar Substitutes (Equivalent Function, Minor Parameter Variance): Parts with 18 V nominal voltage, ±5% or ±10% tolerance, 400–500 mW power rating, and DO-35 package. These accommodate slight impedance or leakage current variations.

Upgrade Substitutes (Enhanced Specifications): Parts with 18 V nominal voltage, higher power ratings (1 W), or improved temperature range (-65°C to 200°C), available in alternative packages (DO-41).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
1N6006B	onsemi	18 V	±5%	500 mW	42 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-35	Obsolete
1N5248B	Microchip Technology	18 V	±5%	500 mW	21 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N6006B	Microchip Technology	18 V	±5%	500 mW	42 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N4746A	Microchip Technology	18 V	±5%	1 W	20 Ω	Not specified	-65°C ~ 200°C	DO-41	Active
1N4112 (DO35)	Microsemi Corporation	18 V	±5%	400 mW	100 Ω	1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N4705 (DO35)	Microsemi Corporation	18 V	±5%	500 mW	Not specified	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5248A (DO-35)	Microsemi Corporation	18 V	±10%	500 mW	21 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5248B BK PBFREE	Central Semiconductor Corp	18 V	±5%	500 mW	21 Ω	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5248B TR PBFREE	Central Semiconductor Corp	18 V	±5%	500 mW	21 Ω	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5248B-TAP	Vishay General Semiconductor	18 V	±5%	500 mW	21 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Substitution):

The 1N6006B manufactured by Microchip Technology (Active status) provides direct electrical and mechanical equivalence to the onsemi 1N6006B. This part maintains identical nominal voltage (18 V), tolerance (±5%), power rating (500 mW), impedance (42 Ω), and package configuration (DO-35). The operating temperature range is -65°C to 175°C, which covers the majority of industrial and commercial applications. This option eliminates design modification requirements.

Primary Active Substitutes (DO-35 Package, 500 mW Rating):

The 1N5248B series from Microchip Technology and Central Semiconductor Corp (1N5248B BK PBFREE, 1N5248B TR PBFREE) are active production parts with 18 V nominal voltage and ±5% tolerance. These parts feature lower impedance (21 Ω versus 42 Ω), which improves voltage regulation stability. Operating temperature range extends to -65°C to 200°C for Central Semiconductor variants, matching the original onsemi specification. The 1N5248B-TAP from Vishay includes AEC-Q101 automotive qualification and ROHS3 compliance, suitable for regulated supply chain environments.

Alternative Substitutes (DO-35 Package, Reduced Power Rating):

The 1N4112 (DO-35) from Microsemi Corporation operates at 18 V with ±5% tolerance and 400 mW power rating. This part is suitable for applications where power dissipation does not exceed 400 mW. The higher impedance (100 Ω) may affect voltage regulation performance in high-current transient scenarios. Operating temperature range is -65°C to 200°C.

The 1N4705 (DO-35) from Microsemi Corporation provides 18 V nominal voltage, ±5% tolerance, and 500 mW power rating with improved forward voltage characteristics (1.1 V @ 200 mA). Operating temperature range is -65°C to 175°C.

Upgrade Option (Enhanced Power Handling):

The 1N4746A from Microchip Technology offers 18 V nominal voltage, ±5% tolerance, and 1 W power rating in DO-41 package. This part accommodates higher power dissipation requirements and extends operating temperature to -65°C to 200°C. Circuit board layout modification is required due to different package geometry (DO-41 versus DO-35).

Tolerance Consideration:

The 1N5248A (DO-35) from Microsemi Corporation features ±10% tolerance instead of ±5%. This part is suitable only for applications where voltage regulation tolerance of ±10% is acceptable. Use is not recommended for precision voltage reference applications.

Compliance and Availability:

Parts from Central Semiconductor Corp (1N5248B BK PBFREE, 1N5248B TR PBFREE) and Vishay (1N5248B-TAP) carry ROHS3 compliance certification, meeting environmental regulatory requirements for new designs. All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can the 1N5248B directly replace the 1N6006B without circuit modification?

A: Yes. The 1N5248B maintains identical nominal voltage (18 V), tolerance (±5%), power rating (500 mW), and DO-35 package configuration. The lower impedance (21 Ω versus 42 Ω) improves voltage regulation performance. No circuit modification is required.

Q: What is the difference between 1N5248B and 1N5248A?

A: The 1N5248B carries ±5% tolerance, while 1N5248A carries ±10% tolerance. Both maintain 18 V nominal voltage and 500 mW power rating. The 1N5248B is preferred for applications requiring tighter voltage regulation accuracy.

Q: Why is the 1N4746A listed as an upgrade rather than a direct substitute?

A: The 1N4746A uses DO-41 package instead of DO-35, requiring circuit board layout modification. However, it provides doubled power rating (1 W versus 500 mW) and extended temperature range (-65°C to 200°C). This part is suitable for applications requiring higher power dissipation capacity.

Q: Are Central Semiconductor and Vishay variants interchangeable with Microchip 1N5248B?

A: Yes. The 1N5248B BK PBFREE, 1N5248B TR PBFREE (Central Semiconductor), and 1N5248B-TAP (Vishay) maintain identical electrical specifications: 18 V nominal, ±5% tolerance, 500 mW power, and DO-35 package. Packaging format differs (Bulk, Cut Tape, Automotive Cut Tape), but electrical performance is equivalent.

Q: Can the 1N4112 be used in place of 1N6006B?

A: The 1N4112 is suitable only if circuit design accommodates 400 mW maximum power dissipation (versus 500 mW). The higher impedance (100 Ω) may reduce voltage regulation performance under transient conditions. Use is not recommended for applications requiring full 500 mW power handling.

Q: What is the significance of ROHS3 compliance on substitute parts?

A: ROHS3 compliance indicates the part meets current environmental regulations for lead-free manufacturing and hazardous substance restrictions. Parts carrying ROHS3 certification (Central Semiconductor and Vishay variants) are suitable for new product designs subject to environmental compliance requirements.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range affects suitability based on application requirements. The original 1N6006B operates to 200°C. Most active substitutes operate to 175°C, which is acceptable for industrial and commercial applications. Applications requiring operation above 175°C require the 1N4746A (1 W, -65°C to 200°C) or Microchip 1N6006B (-65°C to 175°C with verification of specific thermal requirements).

Q: Why is the onsemi 1N6006B listed as obsolete while Microchip offers an active 1N6006B?

A: The onsemi 1N6006B has been discontinued. Microchip Technology manufactures an electrically equivalent 1N6006B as an active production part, providing direct replacement capability. This Microchip variant maintains identical specifications while ensuring ongoing supply availability.

Q: What packaging options are available for 18 V, 500 mW Zener diodes?

A: The primary packaging option is DO-35 (DO-204AH) axial through-hole, available from multiple manufacturers. The 1N4746A offers DO-41 (DO-204AL) package with 1 W power rating. All listed substitutes maintain through-hole mounting type for circuit board integration.

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